— Dad, must we wait for the green light? — Yes, I’m afraid we ________. That’s the traffic rule (规则).

How do you study _______a test?  I study _______working with friends.

－We can’t achieve our dream       we keep        hard.－I agree with you.

 — Jack, is this your coat?— Yes, it is______. Thank you.

We have been friends for nearly twenty years. Nothing can break off our _______.